tmux: Start a new tmux session.
tmux new-session -s [session_name]: Start a new named session.
tmux attach-session -t [session_name]: Attach to an existing session.
tmux attach: Attach to the most recently used session (if only one).
tmux ls: List all running tmux sessions.
tmux kill-session -t [session_name]: Kill a specific session.
tmux kill-server: Kill all tmux sessions and the server.
Ctrl+b d: Detach from the current session.